STRUCT SCMI_MAILBOX(9)

💌 struct scmi_mailbox(9) 💌

okay so this is straight out of the Kernel API Manual and it's literally the whole vibe of the SCMI mailbox transport, packaged as one struct 🎀

---

🌸 NAME 🌸

struct scmi_mailbox — the structure that represents an SCMI mailbox transport. that's it, that's the whole thing, and honestly? iconic. 💅

---

✨ SYNOPSIS ✨

struct scmi_mailbox {
    struct mbox_client cl;
    struct mbox_chan *chan;
    struct mbox_chan *chan_receiver;
    struct mbox_chan *chan_platform_receiver;
    struct scmi_chan_info *cinfo;
    struct scmi_shared_mem __iomem *shmem;
    struct mutex chan_lock;
    struct scmi_shmem_io_ops *io_ops;
 };

like, look at her. all those fields. main character energy fr fr 🫶

---

👑 Members 👑

okay bestie let's go field by field, no skips, no cap:

• cl — the Mailbox Client. your lil client buddy 🐣
• chan — the Transmit/Receive mailbox channel, and yeah it can be uni-directional or bi-directional, she's flexible like that 💁‍♀️
• chan_receiver — an optional Receiver mailbox unidirectional channel. optional!! don't come for her if it's null 🙈
• chan_platform_receiver — an optional Platform Receiver mailbox unidirectional channel. also optional, also minding her own business ✨
• cinfo — the SCMI channel info 🧚
• shmem — the Transmit/Receive shared memory area. this is the group chat they all share 💬
• chan_lock — the lock that prevents multiple xfers from being queued. she is the bouncer at the club, respectfully 💀
• io_ops — the transport specific I/O operations. the how-to guide for the actual I/O 🌈

---

🦋 SEE ALSO 🦋

• Kernel file ./drivers/firmware/arm_scmi/transports/mailbox.c — go read the source, iykyk 📖
• mailbox_chan_validate(9) — the validation bestie, go say hi 👋

---

heads up bestie: chan_receiver and chan_platform_receiver are optional — that's in the original, don't @ me 🍓

---

and that's the page!! sourced from ./drivers/firmware/arm_scmi/tr..., dated October 2026, all about our girl struct scmi_mailbox(9) 💖 slay, bye! 🧚‍♀️✨